Camilla Jefferies (Andrea Berry) is a character from the "The Prime Minister's Brain" book who also appears in the second half of the television adaption of the first series, starting at episode 4. Along with Bess and Robert Jefferies, Camilla is one of the Brains that Dinah interacts with the most.
When Dinah first meets her she describes her as the most beautiful girl Dinah had ever seen. One of the oldest there, tall and willowy with smooth pink and white skin. A great cascade of curling chestnut hair fell down over her shoulders, almost to her waist.